Habitica - Habitica is a free habit building and productivity application.
Loop Habit Tracker - Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their...
Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.
Everyday - Take a photo of yourself everyday.
HabitBull - HabitBull
everyday.app - Every day, it gets a little easier. But you gotta do it every day, that's the hard part.